Fart Box Builds

It was done automatically, I check roughly daily for flagged posts and clear them. Its stated reasoning was you posted a few links and rapidly as a new user. Sorry about that!

I found out now that I ordered a lot of 1W Resistors in stead of 1/4W resistors. So this gives a bit of a different look on the PCB, :slight_smile: which is cool.

Also found that the power connector and i/o connectors I ordered don’t fit. Not sure yet how I will solve that. So that is marked but not updated yet in Version3 of the part order list.

I ended up with:
1 cap of 100nf too less (C13)
1 cap 1uF too much
1 330K resistor missing (R61)

(Seems I can not edit previous post anymore.) So here is:

Revison4 of the part list:

https://www.taydaelectronics.com/savecartpro/index/savenewquote/qid/42153942473

qty,sku,name
15,A-7637,RESISTORS 100k R19 R52 R53 R20 R43 R42 R54 R29 R55 R21 R56 R41 R40 R45 R39
13,A-7636, 10k R25 R28 R14 R12 R16 R30 R49 R15 R27 R23 R64 R59 R57 R58
3,A-2339, 20k R10 R9 R51 R17 R3: 1W->1/4W
4,A-2246, 220R R24 R11 R8 R26
4,A-2340, 1.8k R2 R44 R38 R13 Rev3: 1W->1/4W
2,A-2180, 470k R18 R22 Rev3: 1W->1/4W
2,A-2771, 24k R34 R4 Rev3: 1W->1/4W
2,A-2351, 5K6 R35 R6
2,A-2151, 1M R33 R46
5,A-2247, 470r R32 R1 R7 R36 R50 Rev3: 1W->1/4W
2,A-2281, 680R R62 R5 Rev3: 1W->1/4W
1,A-3855, 1.5M R3ev
2,A-2123, 1k R65 R5
1,A-2279, 47k R37 Rev3: 1W->1/4W
1,A-2726, 18k R47
1,A-3431, 82k R48
1, A-2330, 330K R61 REV4: ADDED
11,A-4729, VARIABLE RESISTORS 100k Rev2: changed
11,A-5527, dust cover
2,A-8005, 1M Attack Release Rev2: changed
1,A-6139, 4.7k Cutoff Rev2:changed
2,A-7738, 20k Trimmer
2,A-7740, 100k Trimmer
3,A-557, CAPACITORS 1nf C6 C16 C2
1,A-568, 470nf C9
1,A-413, 4.7nf C8
4,A-564, 100nf C7 C1 C15 C13 Rev4: 1 added
4,A-559, 10nf C10 C3 C11 C12
2,A-4554, 10uf C4 C5
2,A-3933, 4700uf C18 C17
1,A-8508, 1uf C14 Rev 4: 1 removed
6,A-156, DIODES 1N4004 D10 D11 D14 D12 D13 D9
8,A-157, 1N4148 D1 D2 D8 D7 D16 D3 D4 D15
2,A-8000, LED D6 D5
1,A-207, VOLTAGE REGULATORS L7812 U8
1,A-505, L7912 U9
3,A-037, INTEGRATED CIRCUITS TL072 U7 U4 U3
3,A-857, socket
1,A-1138, TL074 U5
1,A-900, LM13700 U6 missing 2 AS3340 U1 U2
4,A-1319, 16 Pin Machine Tooled IC Socket
2,A-143, TRANSISTORS BC558 Q1 Q2
1,A-8369, BC107 Q3
6,A-4567, SWITCHES SPDT (On-Off-On) SW2 SW1 SW5 SW3 SW4 SW6
5,A-5773, MISCELLANEOUS 2pin Header J2 J3 J5 J4 J1
5,A-4608, male 2 pin connector
5,A-5693, female connectors
1,A-7565, 4pin Header J6
1,A-5506, male connector
1,A-5716, Big Button
4,A-7896, I/O Jacks Rev3: definetly not perfect
4,A-7899, Jack Nuts
1,A-4118, Power Jack Rev3: THIS STILL SEEMS WRONG
5,A-8498, 37mm knobs
9,A-5965, 30mm knobs

Some images of the build process so far:
(Waiting for my AS3340 to arrive)

4 Likes

It looks live you’ve bent your attenuator pins to reach holes intended for the side holes for the intended PCB mounted footprint attenuators that @Willi359 flagged above. Note that I strongly believe that will not work, and that those holes are likely connected to ground (if anything) and not the circuit.

Please, anyone else correct me if I’m wrong here. But if I’m correct, it shouldn’t be too risky to de-solder these once you get the correct footprint attenuators, as the side pins aren’t critical, you can do those first and make sure the middle pin pulls clean. Again, just expressing caution, and hope others chime in. Everything else looks good from what I can see.

2 Likes

I think so too… this should be fixable

Hey,
Thanks for thinking with me. I am also a bit worried about this but as far as I checked the holes are not attched and I patched it on the other side.
So hope it works.

The VCO’s arrived today.
So just missing one 330K resistor (R61) and one 100nF (C15) capacitor.to try it out.
I do have one 1uF capacitor and a 470K resistor. Not sure if someone has an view if that is close enough to try, or good enough to ‘fry’ everything. :slight_smile:

patched? Arent they all going to short to ground now? What’s most baffling to me is that with only one leg actually soldered to the PCB, it’s still such an easy fix to put the right pots on.

As far as I measured the support holes are not connected to anything, but I don’t have the board file to verify.

You can typically use your eyes to see, but the support holes are usually just connected to the ground plane. Mine is in an enclosure so I can’t check it.

I checked a spare fartbox pcb i have laying around. the support holes are not connected to GND or each other. but i also think this is a WILD mod :slight_smile:

1 Like

The fartbox is so finicky that they’ll probably never be quite sure if it’s working right anyway. I know I’m usually not sure about mine.

3 Likes

Did put 3x100k in series, added the 1uF for the 100nF and added the VCO’s.

And YES!! The thing is farting like a grandma, a whale or a little bird. :slight_smile:

Lovely modular synth machine with a lot of surprises and happy ‘gas’ accidents in it.

Thanks for all the support!!

2 Likes

3 Likes

shame you ran out of big knobs

1 Like